The Russian cybersecurity company says it's been notifying users of the change and is aiming for a smooth transition of software.

Some US Kaspersky security users got a big surprise when their protection was suddenly replaced by UltraAV due to a government ban. But Kaspersky’s demise has been looming for years.

Some US-based users of Kaspersky antivirus products have found their software replaced by product from by a low-profile entity named "UltraAV" – a change they didn't ask for, and which has delivered them untested and largely unknown software from a source with a limited track record.

Kaspersky deleted its anti-malware software from computers across the United States and replaced it with UltraAV's antivirus solution without warning.

Kaspersky's antivirus software deletes itself across the US and installs UltraAV instead without notifying customers. Some are frustrated and struggling to uninstall the new program.

As Kaspersky begins its exit from the US market, it forcibly removed its software and replaced it with UltraAV, causing concern customer concern.

The Russia-based antivirus software may be now banned in the United States, but it hasn't left without a trace.

Kaspersky auto-installs UltraAV onto U.S. user systems and deletes itself, scaring users into worrying about a malware attack.

"Following the recent decision by the U.S. Department of Commerce that prohibits Kaspersky from selling or updating certain antivirus products in the United States, Kaspersky part